Multiple Choice
In the photosynthetic electron transport chain, what is the final electron acceptor?
3. Acids and Bases
Organic Chemistry Reactions
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To which of the following does a competitive inhibitor most structurally resemble?
A
The product
B
The cofactor
C
The enzyme
D
The substrate
Verified step by step guidance1
Understand the concept of competitive inhibition: A competitive inhibitor is a molecule that binds to the active site of an enzyme, preventing the substrate from binding.
Recognize that for a competitive inhibitor to effectively compete with the substrate, it must have a structure similar to the substrate. This allows it to fit into the enzyme's active site.
Consider the role of the active site: The active site of an enzyme is specifically shaped to bind the substrate. Therefore, any molecule that can bind to this site must resemble the substrate in structure.
Differentiate between the options: The product, cofactor, and enzyme do not need to resemble the substrate structurally. The product is what the substrate is converted into, the cofactor is a non-protein molecule that assists in the reaction, and the enzyme is the protein that catalyzes the reaction.
Conclude that the competitive inhibitor most structurally resembles the substrate, as it needs to bind to the same active site on the enzyme.
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